Answer: The correct answer for the blank is- The generation of electricity relies primarily on Potential difference (ΔV).
Potential difference can be defined as the difference in electric potential that lies between the positive and negative terminals of a battery.
It can be calculated using Ohm's law, which states that the electric potential difference between two points on a circuit is equal to the product of the current that flows between the two points (I) and the total resistance that is present between the two points. It can be mathematically depicted as-
I ∝ V
ΔV = I • R
I = ΔV/ R
Where I = electric current , R= total resistance.